Flights to Southwest Illinois, Illinois from NT$12,522

View NT$5,273 flight on Tue, 2026/4/7Opens in a new window

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How much is the cheapest flight to Southwest Illinois?

Prices were available within the past 7 days and start at NT$5,273 for one-way flights and NT$12,522 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Apr 18 - Sat, Apr 25
SFO
San Francisco
STL
St. Louis
NT$12,522 Roundtrip, found 3 days ago
NT$12,522
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Apr 18 from San Francisco to St. Louis, returning Sat, Apr 25, priced at NT$12,522 found 3 days ago
United
Thu, May 14 - Mon, May 18
SFO
San Francisco
STL
St. Louis
NT$14,717 Roundtrip, found 1 day ago
NT$14,717
Roundtrip
found 1 day ago
Select United flight, departing Thu, May 14 from San Francisco to St. Louis, returning Mon, May 18, priced at NT$14,717 found 1 day ago
American Airlines
Thu, May 14 - Mon, May 18
SFO
San Francisco
STL
St. Louis
NT$15,710 Roundtrip, found 1 day ago
NT$15,710
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, May 14 from San Francisco to St. Louis, returning Mon, May 18, priced at NT$15,710 found 1 day ago
STARLUX Airlines
Thu, Mar 12 - Thu, Mar 19
TPE
Taipei
STL
St. Louis
NT$31,211 Roundtrip, found 5 days ago
NT$31,211
Roundtrip
found 5 days ago
Select STARLUX Airlines flight, departing Thu, Mar 12 from Taipei to St. Louis, returning Thu, Mar 19, priced at NT$31,211 found 5 days ago
Korean Air
Wed, May 27 - Tue, Jun 30
TPE
Taipei
STL
St. Louis
NT$31,397 Roundtrip, found 4 days ago
NT$31,397
Roundtrip
found 4 days ago
Select Korean Air flight, departing Wed, May 27 from Taipei to St. Louis, returning Tue, Jun 30, priced at NT$31,397 found 4 days ago

Frequently asked questions

How do I find cheap flights to Southwest Illinois that have flexible change policies?
By using our neat "No change fee" filter, that's how. Just enter your travel details, click "Search," then tick the checkbox directly underneath the "Flexible change policies" heading (top left-hand side of your screen). Expedia makes it a cinch to find flexible and affordable tickets to Southwest Illinois.
Which airlines fly to Southwest Illinois?
When you're ready to reserve your ticket to or near Southwest Illinois, these popular carriers are waiting to welcome you on board:

  • Southwest Airlines - 2,214 flights to or near Southwest Illinois each month, including 2,214 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • American Airlines - 971 flights to or near Southwest Illinois each month, including 789 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta Air Lines - 728 flights to or near Southwest Illinois each month, including 650 flights to Lambert-St. Louis Intl. Airport (STL) per month.

How can I find cheap tickets to Southwest Illinois?
In the last seven days, NT$12,522 was the best price for a flight to Southwest Illinois. If you'd love to save even more, book in advance and be flexible with your travel dates. Search for your flight to Southwest Illinois, then see prices for similar time frames by clicking on the "flexible dates" link above.
How much is a flight to Southwest Illinois?
In the last seven days, round-trip tickets to Southwest Illinois sold for as little as NT$12,522 and reached a maximum price of NT$31,397. For one-way trips departing from San Francisco (SFO), the lowest amount paid during this time was only NT$5,273.
What are the most popular airports to fly into in Southwest Illinois?
Choosing your airport comes down to factors including your airline, budget and where you plan to explore. These are your choices in Southwest Illinois:

  • Lambert-St. Louis Intl. Airport (STL) - 4,902 flights per month.
  • Evansville Regional Airport (EVV) - 277 flights per month.

When is the cheapest time to fly to Southwest Illinois?
Consider jetting off earlier in the week to book the best airfare to Southwest Illinois. Tuesday is usually the most affordable day to fly, with Monday right behind it. Saturday often has the most expensive ticket prices. This is because a lot of people choose to begin their trip on a weekend.
How much is a plane ticket to Southwest Illinois?
In the last seven days, plane tickets to Southwest Illinois ranged between NT$12,522 and NT$31,397. Prices depend on multiple things, particularly the time of departure, carrier, cabin class and when the fare is booked.
What months are the cheapest to book a flight to Southwest Illinois?
The most affordable month to score a terrific deal to Southwest Illinois is February, while the priciest month is December. Avoid this month if you're looking to save money.

Travel information

Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
NT$12,522

Trending flights to Southwest Illinois

Prices were available within the past 7 days and start at NT$5,273 for one-way flights and NT$12,522 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, May 27 - Tue, Jun 30
TPE
Taipei
STL
St. Louis
NT$26,870 Roundtrip, found 4 days ago
NT$26,870
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, May 27 from Taipei to St. Louis, returning Tue, Jun 30, priced at NT$26,870 found 4 days ago

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